If a driver's left arm and hand are extended downward, it means the driver plans to:

When a driver extends their left arm and hand downward from the window, this signals their intention to stop. Upon seeing this hand signal, adjust your driving by preparing to stop or safely pass the vehicle. Hand signals become particularly important when your vehicle's turn signals or brake lights malfunction - they allow you to clearly communicate your actions to other drivers. To indicate you're slowing down or stopping, extend your left arm straight out the window with your palm facing rearward and fingers pointed downward. Maintain this position clearly visible to following drivers until your vehicle comes to a complete stop. This downward arm signal is the universally recognized indication of deceleration and stopping.

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